Log Message:
Update mail/clamsmtp to 0.7.

Changes:

  - Added support for ESMTP [Andreas Steinmetz]
  - Fixed crash when too many connections established
  - Announce ourselves as 'clamsmtp' in EHLO/HELO responses which fixes 'loopback'
    problems with certain versions of Postfix 1.x
  - Better IO performance under heavy load
  - Fixed most warnings when compiled with -Wall
  - Fixed other minor bugs